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Hess' Law

Authored by Kristen Vanderveen

Chemistry

10th - 11th Grade

NGSS covered

Used 9+ times

Hess' Law
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5 questions

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1.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

The enthalpies of combustion of C(s), H2(g) and C4H9OH(l) (in kJ mol-1) are as follows

C(s) + O2(g) ⟶ CO2(g) ∆H = a

H2(g) + ½O2(g) ⟶ H2O(l) ∆H = b

C4H9OH(l) + 6O2(g) ⟶ 4CO2(g) + 5H2O(l) ∆H=c

What is the enthalpy change for the reaction shown below?

4C(g) + 5H2(l) + ½O2(g) ⟶ C4H9OH(l)

c – 4a – 5b

2a + 10b - c

4a + 5b - c

2a + 5b + c

2.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

The following equations show the oxidation of carbon and carbon monoxide to carbon dioxide.


C(s) + O2(g) CO2(g) ΔH = –x kJ mol–1

CO(g) + O2(g) CO2(g) ΔH = –y kJ mol–1


What is the enthalpy change, in kJ mol–1, for the oxidation of carbon to carbon monoxide?


C(s) + O2(g) CO(g)

x + y

-x - y

y - x

x - y

3.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Using the equations below:


C(s) + O2(g) → CO2(g) ∆H = –390 kJ

Mn(s) + O2(g) → MnO2(s) ∆H = –520 kJ


what is ∆H (in kJ) for the following reaction?


MnO2(s) + C(s) → Mn(s) + CO2(g)

910

130

-130

-910

Tags

NGSS.HS-PS1-4

4.

FILL IN THE BLANK QUESTION

2 mins • 1 pt

Using the equations below

Cu(s) + ½ O2(g) → CuO(s)H = –156 kJ

2Cu(s) + O2(g) → Cu2O(s)H = –170 kJ

what is the value of ∆H (in kJ) for the following reaction?

(Enter your numerical answer without units)

2CuO(s) → Cu2O(s) + ½O2(g)

5.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Consider the following equations.


Mg(s) + O2(g) → MgO(s)H = –602 kJ

H2(g) + O2(g) → H2O(g)H = –242 kJ


What is the ∆H value (in kJ) for the following reaction?


MgO(s) + H2(g) → Mg(s) + H2O(g)

-844

-360

+360

+844

Tags

NGSS.HS-PS1-4

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